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Hi, Thanks for the advice. The installer set all nobs to maximum and now i have uped the flow rate the system is working perfectly.

guys, thats great. it seems to work. i'll keep an eye on it for the next few days. thanks for all youre help.

Thanks. I'll give that a go.

That's great. I have the VRC 470 It took my heating engineer 4 hours to fit and was still on the phone to vaillant. I live in a 500 year old timber house with no double glazing and 2 babies, so I need the house warm. I have set the target heat for 25c and the heating curve is on 1.2 The...

guys, ive just had the compensator fitted. but i cant seem to get the house warm. can anybody emplain how the heating curve works?